Is there a way to change audio from, front to rear speaker using Realtek audio?

Hi!, I´m using mb GAz87m-d3h with Realtek audio on windows 8, I have my headphones permanently connected in the front 3,5mm jack and a bigger speaker connected in the rear 3,5mm jack, I want to be able to use the front headphones and then, when I want to use the rear speaker, to deactivate the front headphones signal and move the audio signal only to the rear speaker while the headphones (and speaker) are both connected, and then again from the rear to the front hadphones. In the Realtek HD Audiomanager, I just have the option to, whether activate the front auto detection (in this case if the front headphones are connected, it automatically moves the signal to the front, and I can get audio from the rear speakers only by disconnecting the headphones), or deactivate the front detection (in this case, both front and rear signal are all the time active and both are playing together if both are connected). It should be easy to do, but I can´t do this, is there a way to do this?? anyone knows?? thank you

In the Device advanced settings there is a check box to make the front and rear outputs play separate audio streams. Selecting this may do what you want. i am not sure but it is about the only option offered.